带悬挑人行道板流线型箱梁涡振性能研究.pdf

文档介绍：振动与冲击
第 33 卷第 24 期 JOURNAL OF VIBRATION AND SHOCK 201 4

带悬挑人行道板流线型箱梁涡振性能研究
李春光1 ,2 ,陈政清2 ,韩阳1
(1 .长沙理工大学桥梁工程安全控制技术与装备湖南省工程技术研究中心,长沙 41 01 1 4;
,长沙 41 01 1 4)
摘要:为了研究带悬挑人行道板流线型箱梁断面涡振性能,以某大跨悬索桥为工程背景,进行了涡振性能影响
因素及气动优化措施的系列节段模型风洞试验。分析了来流攻角、检修轨道等对断面涡振性能的影响,研究移动检修轨
道、附加轨道导流板以及底板竖直稳定板等气动措施的制振效果。结果表明此类断面对风攻角较为敏感,随攻角增大涡
振性能逐渐变差,同时涡振幅值随阻尼增大呈非线性加速衰减趋势。检修轨道是此种断面形式的涡振敏感构件,检修轨
道向箱梁底板中央移动能明显改善涡振性能;轨道附加导流板能进一步抑制涡振振幅,导流板越宽效果越明显;设置斜腹
板导流板对改善所述的主梁断面的涡振性能效果不明显。
关键词:涡激振动;悬挑人行道板箱梁;节段模型;气动措施
中图分类号:U448 文献标志码:A DOI:1 3465 /
Vortex induced vibration performance of a streamlined
box girder with a cantilevered walking slab
LI Chunguang1 ,2 ,CHEN Zhenqing,2 ,HAN Yang1
(1 .Hunan Provincial Research Center for Safety Control Technology and Equipment of Bridge Engineering,
Changsha University of Science &Technology,Changsha 41 01 1 4,China;
Engineering Research Center,Hunan University,Changsha 41 0082,China)
Abstract: A longspan suspension bridge using a streamlined box girder with a cantilevered walking slab was taken
as an engineering on a series of section model wind tunnel tests,both the vortex induced vibration(VIV)
performance of the main girder and the optimal aerodynamic measures were influences of attack angle
and g